Interpolating continous rotation
In your current F-curve the interpolation between frames (75,80) , (125,130) is linear, and because there is 5 frames between the frame sets I mentioned instead of 1, the rotation reverses in those 5 frames, causing the object to spin backwards very quickly. What you can do:


Bring all the keyframes starting from frame 80 back 4 frames, so the
gap becomes 1 frame instead of 5, and I recommend changing the
interpolation from linear to no interpolation, so if you change the
framerate or move the keyframes a little bit, the backward rotation
will not be visible a lot. 
Do that with the keyframes starting from
    130, and for any similar 5 frame gaps.